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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4708734cdea725cdb17ec75356080d3248b94a51d4d9654da9ea1fd92c5329' 
  AND token = 'JEytQ+enGQmfLBdLA05chvtAyW99pzci2tv4KO/NKl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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