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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd671260c85e94c1501a7e3bef6434a62b990ec8d3a8a518943f106a826a57fa1' 
  AND token = 'DyD2uxRZeBceC7QVWNcLzubV3fbZk+okduL8EAE7BAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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