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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1cdca8e484761f93005dd37f94d78801f7bd93fbdf90a5f0d2623340d315e3b' 
  AND token = 'ajvvIf/W7mxVKIhDcb3w8emF8xnr4BB1nn+knUVJsNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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