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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e5367731bfd9da893b5710b191e1c0d73212bb9f41af5ebba267e58aa416f7' 
  AND token = 'o5DayTf9nS9lgQzcvnkflFz0omMbmfSnag693eFSizs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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