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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209eef083a187e9bdb71bc42273ea26bd980b1dc92c712c2b9ea910389c78b41' 
  AND token = 'CA+wCIZk20fXalOKe+8eF9FRgZBdsaSkEnXR02ekUMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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