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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea47533415e7fbb7616d7b12426a4699d8fc46bff7353ee193372c99c2acee5c' 
  AND token = 'mhkjlA/lU0gLSy77+HuWbS+DWCW5BxGkXnSH1m5rkvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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