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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5f7003f3cd1d03e226d3a117d33d571532c7f60828b789da5e0b0c5d1e40a2' 
  AND token = '0ZOjyhgOLYVX8pxSV6grAfv88CHzXNrmF25qmqYbkBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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