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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd18177d9677e4dce7aa0eadc518ad1a6a7a0f6c65450ca10d8f0a261b1952d' 
  AND token = 'iVTZH0AqWzKwjMdtC33tkk6VvXdFQB4ELh2tM4YEdMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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