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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4d95f3c261861276e8e1561737ecdab7daf7fed96ef58c104a030cd09e52f9' 
  AND token = 'V4gFPd4jDUhhyNxfmx6ZL90njMovjUtrZuA8D22n0eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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