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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f93c36d66544877b9bbb994f3a069e87b7e54e70ee155474ab95120cb97b36b' 
  AND token = 'jmBtr86bUa82GL++h7fhMi7IxgNS+kzQ01k4gLrji3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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