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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d64b030675dab34347d445060c596bd69ff99372ca9a9924fccc97257d366f' 
  AND token = '4xUg3mGMno8w+u3JnsWf5vp5F0q6+2Vi4er5pDKAHDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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