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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c42e7514075e565d6f967172d620ce2cfd397313c7ca73c93157e2266babf27' 
  AND token = 'oRsZA5W6r4ew8KHSbUU945sWGR8NnEM33F/8VcGKwwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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