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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e846e1d8310629d910df0af3a056c80718f63c05bfd25eae917784688374e23a' 
  AND token = 'DcYkz4nQc8tf4tyDTQJXkgGCVzhpLt72m+Jw83roc5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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