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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ddafdb68d9b3a4cf7ab2269f93c9a7b11431e016939b3993c0b164745f6071c' 
  AND token = '0mLLFEsqN0BUK+OGFxrA5vQ2yG6wsWS3ApRkUEXTTsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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