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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9260b69d0008e048916bf20be762ae8d2ff9c11ac5e0a389300be142e679b6' 
  AND token = 'qt1RBQUhVJbYeaF/Vqpu2iZkrVkDbt50NGfH+RYBqHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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