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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd86b2e9dadf12b7fea35320bf0acbd72636103baa110a7c34e6015886b31e85' 
  AND token = '99Kz6lxoyoCp3AdE188jZLLNv/hKxhLbNPhdwGLoQTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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