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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19095f98ca290110441d7cfb62d22fbddd01800a9fde95dc5db3c4b5efc57792' 
  AND token = 'WStR6g6ff5DpNWQGt0l0JE+H6yUCvwV1dOb9ZunP1x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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