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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf6cef62a78de16d9c5ae900eb696b0a23c664ce674405c1e2af66e2585cad8' 
  AND token = '1o7PpVCxEBmvOwD23CCPi6PW9FOTB0+3h6cAf8t/d/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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