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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0825b2a9d06d080f7766b5591df95de730967c3e8961e4549b6e2231d962321a' 
  AND token = 'dY7xd+tuwvccJ+0W+7dA58XtHuJRCdSoc0Pio0roioQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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