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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc58f52f67580bb34c5af52a71d7e215d5d3f553b059cd7d79b363e49add9cb2' 
  AND token = 'zvlUgfJHQnyVpe5lDXM3aazDFJR/hDhdb1A3exFlsg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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