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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0a96efd64f45d6db8cb178f63030c9186987408c04bc25bcbc02a0591cccd9' 
  AND token = 'dZXJH7r32jQD8vDYD+j0JHFuA9gm7NQhf8m909NF3N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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