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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968ea9cfd7b69f3fc6df2ad6dabd77fb950197b6c3923359ff4d1ea3648ada81' 
  AND token = 'YQzf2h9gqL4Hh6sd/1dFdUDJI7dXsheex2KP2PLq93w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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