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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '399fb22b5cdaf1828ac4fedcf8bac5d73538fe34588e3188a5b891d989a0b0c7' 
  AND token = 'E0+TUtS+2ToPZCSyTngj2TJxluwolbqFY+UByqZUOxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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