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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e179a111087e5f4bf13b1bb547936f658e4d18bb644b5ae886aec7ea4322ce' 
  AND token = '8puxA8EGh+skr5TCgyKsD/Z9hcS3ePLp19dcw6ChP7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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