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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2971c29e9fa47798c1e998f242c6b38a59dc996531140c92e53ece1f4618cb5b' 
  AND token = 'ShfV6qwzsIbdKUmzRE5Ct9ZOzKAXZ9axqXF4GR706DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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