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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad10410130f4b497c8ac23d6c20f148e8f4f9ff85e467efbe198612897b6dc17' 
  AND token = 'rF0AIyD/6UrWtNrwSHHUWG6Btbv1YvJqhoEOCmlfQ3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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