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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c108a8d92df101fe9d3f2fb6879c6895e2acca18707ebe7f9c2a80e97f6e26f' 
  AND token = 'xMXEWo6eUAT8+xuSi9JF1q+EoDJLIe/O7mdX6Pg6B+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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