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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365dc4983427dcb65c66f75a8e4e55fd680ab77774d750628752ff9544606a1f' 
  AND token = '4yfMAQ+/lziD5+Tr9nPN0zHdroq2zrwnpUORcmLsVfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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