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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9265e74f49ff7857d4d65ba561e6abd379146641796346c566b03e79bc2ee9' 
  AND token = 'F8HZH9vxZfYjEyhgJ8gDc0kL0ZwFdeeuMMAXm1UcB7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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