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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0bf6c2e70c1384e86ac2c606148e5c8818e5c09d04a99f147c7ed9637a0699' 
  AND token = 'lTO6VH7h+HHFfHLTTMFj2OsirU8s3DzvmSNhFkyBhX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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