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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5565578e022e5137d266daccb10639f77affe8b0d768f959c4815b674b968c3b' 
  AND token = 'Kkas1M4u+v6YxUiOVSDnQ+T2X58ew1ym3spwBacp77Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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