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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7ebe5d2d74d80435ba4c8ad49c539a4407b29f6a5546390f6d5f1f67d9dc6d' 
  AND token = 'Oa630CBvZXO5e3KiBW74Xje9YUdBvsNeVjshXHYlGBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00118

JSON explain

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