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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e530f43147d5495b29149a673710ebab25e47a152acbb1606eedc7f88992e027' 
  AND token = '+oQVxGFWNicyAMZgdag9gB9jbkUAEX5QCdbJ9En8aQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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