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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174e58c7ca47c7e7f4738e13da8cc0bb678cc2bbeb287476ad3c536634136832' 
  AND token = 'V6JdHE3jBdyjmXzVDKhzhs6Uuu//f3XLgUbk584STq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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