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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11f038aebf7dd847831199fda2c0b487b99c476b69a04f88767954dac58da96' 
  AND token = '3+cv3yLS8QrhZtG7kpP9gh8gRNdCL1vsbpJ30lE7534=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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