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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bebdcf56a5a159bbf0d3c6ea98b87ca3655b58bb2c2971388fd2ff12d20e6bb' 
  AND token = 'HAf/+iXT0jAKGiv0uWbnjfKgbAUo26dxlHUY7N+YszI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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