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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46c11d93b71af9335daa49e297f3b5acca2d1346a66c4a01f16864f04c3ede4' 
  AND token = 'GZA+X9N0cFT0lyRZMwf/Q6sTm/sZeBJIgTRfXO3e+X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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