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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f86f30de6b7f7d3aa3efa264647c5644b5acfca0ab0034d5cfb38faa3ce12f' 
  AND token = 'gNSRKLUtiVshM+SyA4lOJ6mKMw8xMju3vhogWKUECMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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