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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ee8fd6df9f940c9c08d5401af23ce986d045b7d773bc80b64264a12ff5c410' 
  AND token = '9jxs3mTioTU3xc6m4qDD7b5Zhi0h5NgP/J7LDi6rIq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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