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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c1d66541eaf6e6eeb3dd3a9bde815024c48aa8524f2812c674e4efb45c6c60' 
  AND token = 'N7Y85pBS9022La09a2oYr/KfAQk1y2mGZzIGDplxsDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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