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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec1de2769318e55ffd12330d542ee3ecc0a77062fcd42672deb311eb0e71bb9' 
  AND token = '338SYaRb7D6flgsegEKBcv6DQ2631pIBu76FvaI+Bf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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