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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeda732f1cdc452f345f54d4f3047ea78023c01bd59759c104d74f08e71c64b6' 
  AND token = 'alVejFU47eJVij0kxXLmh3buGnrqmxQEplRs2rGxA6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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