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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ca415dbf15562add8a06342e827743597ee5992faac3c37813c515b7158f2e' 
  AND token = 'Mu9md5SUYmJ+7g5MOc+/XGvbDdW7jLQLS1izQixSYWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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