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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e3eaed7c04e561b4e1786ce6939fa5145e030b35cee086a173875c52ee7bba9' 
  AND token = 'yGduYpJMa83iY6GCuFO8idC/BN+tjcQ0OhIrmaMyAAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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