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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7e933d7114e0fa5d055bd2dbf730790bc0dad1e4e5edc625f07db4c7b89f7e' 
  AND token = 'm/TgGYHMcsRenbhu5L9d4KYi3oKVHY6UgBJ6E6/RGZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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