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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d43af1d56aadf4b44fb4018094900969a12b1b8c12fd421210ffafa3d1dbb2b' 
  AND token = 'WhMS2w7wdNSecCK/4PDGcSF7/AzdohgCEocWG6Yxa7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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