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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a984dec297fad639516f1fc8de4a8e7eb834e73e7d2ec2309cc5ee6541fe7421' 
  AND token = 'LzaurgmMWn8KGm0sJ1cOLYjdrmo4wT6nJUotPfLq/NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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