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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f41025477c188577c125b9669451268f6d0f55386dc28e6c0f6a4ae62e228e17' 
  AND token = 'f4xZdF+EnbECUSlQeeYCi453krFiWp+PREaQNKc8Sp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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