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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3088b3363ba0a753c8e52a9a4668d41724ab04c00bfb00315bb597ff41ceaec' 
  AND token = '11/RzB/aMYFJpxO4S4r9IodcvWyRRKhVRdl3vamBTBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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