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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b1a59ba8e85f1dd61b536b29c872b4e82c0397b1bfb4ec35d3eb26e8f3d18b' 
  AND token = '7NU62jALcSZKfMFN4OgSxhxwW7Gu+XME04Eo7PLcsrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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