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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a3caf86aaf9a976193581961b22175add5445dd5f40bd5e468b9c75268b213' 
  AND token = 'hebch2kaYQM7TD8SQd98ZP7Sr1fhKwmU3MfuT1JHvQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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