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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f89c22bdaa05b3f484cdd44f3e6386f377b819c0b168634fb6b0aa92822a60' 
  AND token = 'ojLl6glo8bG0DLvA641u1fToren0ncGpM8NOg4OG3CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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