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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029a1de8dee5ea4838ddf098c7e452ff3efc32dc4228f5655c5a6c28f7512716' 
  AND token = 'odS7sfkc/opItsyQFQhsaomPuPeoXaYieR3FCE3cS2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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