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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed585e0bc229b5431f2108ac9606a3382bf41a05d6b433acef0f9d14bbaff95' 
  AND token = 'ZpvtYplhfoRew1AZTUy7PH0TZ754o5ninAXLowa2aX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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