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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebb866b17d09f7241f0ca82e31534545d4d00abfbc8df270a35b7082d99f78e' 
  AND token = '7JaU95a1jMrfJ9vtBA8kBqbe8X7WfWJ6D7aaOFSR7BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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