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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6ac9e1acc3dc570195946bb468d95ece58d3c43b6a99ce4567a0b78f4d77c8' 
  AND token = 'c79lNo8TwSTeDr2t9C9QLW7JkS9VLHYMuLfdgP1W9WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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