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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16823d274e884b8162988def9ccd371f0872e890577f31d4bfb209e576900ac2' 
  AND token = '0wrQxbSHgB+k0u3NM3+kfecCNzZX/saEojD+crjoWU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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