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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8d3ffeae66afe57cd6d0d2aa5a77e92cc8e3b232b1ba9e7b15b864643beb63' 
  AND token = 'q3cpgbzNKb09tpaDVKj8BJ/gWNi2umomx13HtxS/Piw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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