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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e37f2af7aca6009a981e9a91a19bed90d828a407fc6d9cd4f97a1ee8515d26' 
  AND token = 'nd9YmoOi5z0HWvXuGGPCZM1RHMp6qvpwZwVY7dkXDHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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