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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8650ebdb0a7d3f1a168028f6f11d41d491787aafce852d87264ec370abd5346' 
  AND token = 'LNRI71DSdy0E3WXdDZ3elU0X7YqyigHuC9RRsxXJR04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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