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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86152c3980467f3beeab6a1774b0b8f0a820b02328e6a9fba7d7faf856686e62' 
  AND token = '7JKtBBN1A8Sy0/yFN+wPwcqq4rIxDzc/rHu5XdkezbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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