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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61828bdb07d6f37f38282470effb4258b9d62d615a3ddbb078c9310305ad911a' 
  AND token = 'mSdHb210TTienEGlcfnCoS9/c5xYjrSIU5iI28DrocQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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