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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3691ecac485c02904f704b38f8ee293fd5aec23f86667fcd4d9bf858a930b383' 
  AND token = 'uycDf8etJBhnK339OF4/vAMkYdBw14EFQIxzcsyOwfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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