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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0574f60d1fbd3dcb9a22e70bf8e60b86aabe7022e007585eceb6455576eb1ef3' 
  AND token = 'IEDvRaV2ssJ6iVJF5SrjOUuHJ0uIB/irK77MOEM2gXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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