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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c138143d03da03c5d03ff40a03fe704171511a8c8604ede1bce60d93d267ec84' 
  AND token = 'LE5lX0VOm9pQQlSUQJmxPhpSzxMmh+V1aIFi38ph448=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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