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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24af33fc11b2fe510c6840d6cf54f553bbec4c1cdcd1d62d373cb524f6e75c2d' 
  AND token = '+CBHjxtnn5YD6QhBOYVShCNflnF4Wc/ZOEV1zUadPIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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