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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3123137c21452a121c2aef15e90f4808fa5d26e59b2f832a530808db54ed3810' 
  AND token = 'SmDqAT21/CyZ97TZ6hXBavz5GiTLia/+9h5JhZKTs/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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