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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f64df20c4373f9ec7102a1caab4dc6f39af96981fadb6c08f8004c61456636' 
  AND token = 'mCLdZc6Gv2fOTxRzMdLuRtTuvlKFtBS9WG6W11rkW+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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