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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c7796a40f6c1fb899c281b40247dce8016f5db4a9f4687e521dbf8e613fe7a' 
  AND token = 'Ch+NYAfbXdYabV2sQOVAno/ElagKp3eY4rhUA4YL8/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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