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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd462b805d29885484062e38f8376b0e7c23e80db7a8408103382914429e5325d' 
  AND token = 'mfiPkC6ch4HYvWeFymVdRf9ch09xfPZ4b+4w4bdfBJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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