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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd464446d22404c89fecc49aac1720c4cd6c858feddd4076a3acab77fd06b70a8' 
  AND token = 'B2hmeyTWk4Zetz66oOqYGRqQDK5uPRa2OSm7OELD8nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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