SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94730fc7bcf346bf21c403af72f536cde4b2eaf3e8f3a54e5a4d35d082038e8b' 
  AND token = 'Bp7sl3VjSMN4ooKjGya/j+RRVYZmhd796uqZq5HlCr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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