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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbbfc3b90aeed6869e0040ec5bb159bc88734dfa4f981ceb8a2bed2d50bb2da' 
  AND token = 'pKPEDWpoIopU/5Qrf4BxfVX6QtgtkxMnKhD5e1s4G6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}