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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fcbe2094c501e6d42820e9b65a87e239919cafe2e22002bf43894f22555962' 
  AND token = '1WBTseavdemI3zW6YycUb8JaJ98rpO5aW4UjLxN0DwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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