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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca26e810b5e16ee4919f6330665d64fe67032963383d6c2f32b682006517b4a' 
  AND token = 'Yuqooy3lRwCt10sz5nS+j+LvM83pgTFu7VB5YOkUAro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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